We upgraded our Vodafone Fibre contract from 75Mbps to 500Mbps 2 weeks ago. Since then, incoming phone call quality has degraded - staccato / jittery speech difficult to understand. Outgoing call quality is unaffected. This occurs with all 3 phones we've tried: the existing BT base and handsets that worked fine with the same router until now, a borrowed Siemens phone, and my mobile when it connects to wi-fi for calls.
Customer Services Call 1: Extensive diagnostics - no problem detected from either of the two Tel outputs on the router. They send a VOIP adapter. My phone connects directly to the router. A VOIP adapter is for 'old style' phones - add it between router and phone (using an old-fashioned cable) and there's no dial tone at all.
Customer Services Call 2: A step backwards - "Please try your other handset" - "I promise you that'll be no different, but give me call" - "Hi - no better - let's continue the discussion on the mobile I called you from". They ring back - logged for 1 sec - before texting to say they couldn't get hold of me and would call again in an hour. I set attentively for 75 mins. No missed call, then a second text to say they hadn't managed to contact me, and for me to phone again. Customer Services now doesn't connect the call, an automated message stating I need to seek help online!
So I thought I'd ask hear for thoughts as to what the issue is before I try and contact Vodafone again. Do I ask for a replacement router, or for a BT OpenReach visit to check their kit?
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